According to producers, Snyder (Cry-Baby, Johnny Baseball) "will play Josh, a doctor and army reservist who meets Elizabeth (Menzel) on her first day back in New York City."
Additional casting and the full creative team will be announced shortly.
Rapp (Rent, You're a Good Man, Charlie Brown; Six Degrees of Separation; Precious Sons; The Little Prince and the Aviator) was recently announced to star as Lucas, "an old college friend of Elizabeth, who reconnects with her when she moves back to New York City."
Also set to appear in the musical are Tony Award winner LaChanze (The Color Purple, Once On This Island, Ragtime), who will portray Kate, "an elementary school teacher and new neighbor of Elizabeth."
The musical has music by Kitt, with book and lyrics by Yorkey. The writers earned the Tony Award and Pulitzer Prize for penning Next to Normal.
Next to Normal and Rent director Michael Greif will helm the production that will premiere in an out-of-town engagement at Washington, DC's National Theatre Nov. 5-Dec. 8. It officially opens Nov. 24.
Here's how it's billed: "On the verge of turning 40, Elizabeth moves back to New York City, the ultimate city of possibility, intent on a fresh start – new home, new friends, and hopes for a resurgent career. But even in her carefully planned new life, the smallest decision or most random occurrence will impact her world in ways she never dreamt possible. Set against the ever-shifting landscape of modern day Manhattan, If/Then is a romantic and original new musical about how choice and chance collide and how we learn to love the fallout."